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For a scheme modelled using the DWF method, the diagonal coefficient becomes zero when ___________(a) DWFf > 0(b) DWFf > 1(c) DWFf > 0.5(d) DWFf > 2The question was asked in homework.I would like to ask this question from High Resolution Schemes topic in chapter High Resolution Schemes of Computational Fluid Dynamics

Answer»

Correct choice is (C) DWFf > 0.5

The EXPLANATION is: For values of DWFf LARGER than 0.5, results in a system with NEGATIVE diagonal coefficients. So, the system becomes unsolvable by iterative methods. This happens whenever Φf > 0.5(Φc+Φd).



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